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@@ -10,11 +10,39 @@
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##### 图例 3.1 –CONNECT报文的固定报头
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| **Bit** | **7** | **6** | **5** | **4** | **3** | **2** | **1** | **0** |
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|---------|------------------|-----------------|-------|-------|-------|-------|-------|-------|
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| byte 1 | MQTT报文类型 (1)[7-4] | Reserved 保留位 |
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| | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
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| byte 2… | 剩余长度值 |
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<table style="text-align:center">
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<tr>
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<td align="center"><strong>Bit</strong></td>
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<td align="center"><strong>7</strong></td>
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<td align="center"><strong>6</strong></td>
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<td align="center"><strong>5</strong></td>
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<td align="center"><strong>4</strong></td>
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<td align="center"><strong>3</strong></td>
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<td align="center"><strong>2</strong></td>
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<td align="center"><strong>1</strong></td>
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<td align="center"><strong>0</strong></td>
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</tr>
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<tr>
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<td>byte 1</td>
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<td colspan="4" align="center">MQTT报文类型 (1)</td>
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<td colspan="4" align="center">Reserved 保留位</td>
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</tr>
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<tr>
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<td></td>
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<td align="center">0</td>
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<td align="center">0</td>
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<td align="center">0</td>
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<td align="center">1</td>
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<td align="center">0</td>
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<td align="center">0</td>
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<td align="center">0</td>
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<td align="center">0</td>
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</tr>
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<tr>
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<td>byte 2...</td>
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<td colspan="8" align="center">剩余长度</td>
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</tr>
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</table>
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**剩余长度字段**
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